- Archelon LLC
- AG Edwards
- Bank of America Securities, LLC
- Bear Stearns and Co. Inc
- Blue Capital Group, LLC
- BMO Nesbitt Burns Securities
- BNPParibas
- Calyon Financial Inc
- Charles Schwab & Co.
- Chicago Trading Co.
- CIBC World Markets Corp
- Citigroup Derivatives
- Citadel Derivatives Markets, Inc.
- Citigroup Global Markets Inc
- Compass Professional Services, LLC
- Corbett Capital LLC
- Cornerstone Trading LLC
- Cowen
- Crédit Suisse First Boston
- CyberTrader, Inc
- Dart Executions, LLC
- DC Trading Partners
- Deutsche Bank Securities, Inc.
- Electronic Brokerage Systems, LLC
- Equitec Proprietary Markets, LLC
- FIMAT USA, Inc
- First Derivatives Traders, LP
- Fortis
- Gargoyle Strategic Investments, LLC
- Global Execution Brokers, LP
- Goldman, Sachs Execution \ Clearing
- Goldman, Sachs & Co
- Hardcastle Trading USA, LLC
- Holland Trading House, LLC
- HSBC Securities USA Inc.
- Interactive Brokers LLC
- Israel A. Englander & Co., Inc.
- Jefferies & Co
- JP Morgan Invest LLC
- JP Morgan Securities, Inc.
- K&S Trading, L.P..
- LaBranche Structured
- Lehman Brothers, Inc
- Lek Securities Corp
- Man Securities, Inc.
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- Master Blaster Trading Co LLC
- Maxim Group, LLC
- MDNH Traders, LLC
- Merrill Lynch Pierce, Fenner & Smith Inc
- Merrill Lynch Professional Clearing Corp.
- MM Squared LLC
- Montecito Advisors, Inc.
- Morgan Stanley & Co.
- National Financial Services, LLC/Fidelity Investment
- Nomura Securities International, Inc.
- OptionsXpress, Inc.
- Optiver US, LLC
- Oscar Gruss & Son Incorporated
- Parallax Fund, LP
- Peak6 Capital Management, LLC
- Penson Financial Services Inc.
- Pershing, LLC
- PFTC Trading, LLC
- Pictet Overseas, Inc.
- Prebon Financial Products, Inc.
- RBC Capital Markets Corp
- Redsky Securities, LLC
- Ritchie Capital Investments LLC
- Ronin Capital
- Samurai Trading, LLC
- SG Americas
- SLK/Hull Derivatives LLC
- South West Securities, Inc.
- STC, LLC
- Susquehanna Securities, LLC
- TD Options, LLC
- TD Professional Execution, Inc.
- Terra Nova Trading, LLC
- Theata Analytics
- Timber Hill, LLC
- Tradestation Securities, Inc
- UBS Financial Services Inc.
- UBS Securities, LLC
- Vtrader Pro, LLC
- Wachovia Capital Markets, LLC
- Wolverine Execution Services, LLC
- Wolverine Trading LLC
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